Running 2 instances of Frontline SMS concurrently is it possible?

I am building a purpose specific PC for use solely with frontline SMS. I have a requirement to have keywords from different users trigger different events IE one group of users given one mobile nmber and that posts to twitter (already tested and working OK on a laptop) and another for general text communication.

Problem is when I am bulk texting one group, if another group needs to send a twitter via my SMS box, It must be as near realtime as possible. So if I'm sending 300 or 400 texts this is going to take time, so I started thinking. Do I need two complete systems?

If I am not bulk texting, it should work fine, BUT if I am I think the command to post to twitter and respond via text to the sender is going to take a back seat and by the time it is posted to twitter it's too late. It needs to be out within a few minutes maximum (twitter jitter allowing).